Question: Who is the student of Luke Skywalker?
Paraphrase: Who is the understudy of Luke Skywalker?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P802 wd:Q51746 . ?sbj wdt:P31 wd:Q15632617 } 
Answer: Obi-Wan Kenobi